This is what makes Robert Downey Jr a real-life superhero

Downey Jr face times with 18-year-old cancer patient Ryan Wilcox.

Robert Downey Jr has the "kindest heart in Hollywood", as the Iron Man actor recently face-timed with cancer patient Ryan Wilcox, proving once-and-for-all he is the superhero, not only in movies, but in real life, too.

Downey checked in on Ryan, an 18-year-old boy battling AML(Myelodysplastic Syndrome), a secondary cancer, for years now. A photo was uploaded to a Facebook page dedicated to Ryan Wilcox, featuring the Iron Man actor face-timing with the sick fan.

The post said, "So this just happened...just in case you all needed a smile. Ryan and his pal Robert Downey Jr. face timing. This definitely made us smile BIG. Joy is a very powerful medicine. Thank you RDJ....one of the kindest hearts in Hollywood. ‪#‎IronMan ‪#‎RyanStrong ‪#‎GodSpeed ‪#‎IBelieve". Marvel actors Downey Jr., Gwyneth Paltrow, and Chris Evans paid a visit to Ryan earlier in May, 2016.

According to a report in Comic Book, their conversation was a simple affair, with no press or publicists involved. Robert wanted to check in on Ryan, and see how he was doing, and the chat surely meant a lot to the long time Marvel fan.

Downey's move was lauded by his fans on facebook, with one user commenting , "This fills up my heart for Ryan and for you. Kind hearted, compassionate hero! Thank you Robert Downey, Jr. for bringing a smile to all of us today but especially for the joy you've given Ryan and his family.

Previously, Gwyneth Paltrow took to social media to post an image of Evans and Downey smiling alongside Wilcox. She captioned the image as, "Today @ryanwilcox0303 got a little surprise. Thank you to the incredible #chrisevans and my better work half @robertdowneyjr for being the men you both are. And thank you to the Wilcox family for your hospitality!"